A) More iron and \[P{{b}^{2+}}\]ions are formed
B) More lead and \[F{{e}^{2+}}\]ions are formed
C) Concentration of both \[P{{b}^{2+}}\]and \[F{{e}^{2+}}\]ions increases
D) There is no net change
Correct Answer: D
Solution :
\[\Delta {{G}^{o}}=-n{{E}^{o}}F\] \[F{{e}^{2+}}+2{{e}^{-}}\to Fe\] ?..(i) \[\Delta {{G}^{o}}=-2\times F\times (-0.440\,V)=0.880\,F\] \[F{{e}^{3+}}+3{{e}^{-}}\to Fe\] ?..(ii) \[\Delta {{G}^{o}}=-3\times F\times (-0.036)=0.108F\] On subtracting equation (i) from (ii) \[F{{e}^{3+}}+{{e}^{-}}\to F{{e}^{2+}}\] \[\Delta {{G}^{o}}=0.108F-0.880F=-0.772F\] \[{{E}^{o}}\] for the reaction \[=-\frac{\Delta {{G}^{o}}}{nF}\] \[=-\frac{(-\,0.772\,F)}{1\times F}=+\,0.772\,V\].
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